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In any case, I don't think that it voids your warranty as it is a part that the consumer can upgrade; but, you should check the terms and conditions of your warranty just to be sure, as different manufacturers have different policies.

I asked Lenovo about this matter when I bought my T61, they said it does not void your warranty on the laptop, but obviously the drive you are about to install won't be covered by Lenovo. The origional drive that came with your Thinkpad, and the laptop itself would still be covered.

Same goes with RAM.

They even have manuals of how to replace various, user-swapable parts.